Sikasil WS 305 S is a high-performance, neutral cure silicone weatherproof sealant designed for sealing and protecting exterior building joints exposed to harsh environmental conditions. It provides outstanding adhesion to a wide range of construction materials, forming a durable, flexible, and watertight seal that accommodates movement caused by temperature changes, wind loads, and building settlement.

Engineered for long-term weather resistance, Sikasil WS 305 S offers excellent UV stability, ozone resistance, and resistance to rain and humidity, making it ideal for both commercial and residential construction projects. It is suitable for use in curtain wall systems, window and door perimeter joints, façade panels, cladding systems, precast concrete joints, glazing applications, and general exterior weatherproofing.

Its non-corrosive neutral cure formulation allows safe application on sensitive substrates such as aluminium, stainless steel, glass, concrete, masonry, ceramic, and many coated metal surfaces without causing staining or corrosion.